KR100455478B1 - Optical pickup using reflective focusing lens - Google Patents

Optical pickup using reflective focusing lens Download PDF

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Publication number
KR100455478B1
KR100455478B1 KR20000085003A KR20000085003A KR100455478B1 KR 100455478 B1 KR100455478 B1 KR 100455478B1 KR 20000085003 A KR20000085003 A KR 20000085003A KR 20000085003 A KR20000085003 A KR 20000085003A KR 100455478 B1 KR100455478 B1 KR 100455478B1
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South Korea
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light
lens
light source
optical
monitor
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KR20000085003A
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Korean (ko)
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KR20020055781A (en
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김영식
김철민
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엘지전자 주식회사
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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126Circuits, methods or arrangements for laser control or stabilisation
    • G11B7/1263Power control during transducing, e.g. by monitoring
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1353Diffractive elements, e.g. holograms or gratings
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372Lenses
    • G11B7/1378Separate aberration correction lenses; Cylindrical lenses to generate astigmatism; Beam expanders

Abstract

Disclosed is a lens for light collection for total reflection for a front monitor photodiode (PD) in an optical pick-up device. The optical pick-up device includes a light source provided with a holographic unit adapted to diffract a light beam, an optical disc arranged in front of the light source and adapted to allow data to be written thereof or to be read therefrom, a monitor photodiode arranged in front of the light source in a diagonal direction with respect to the light source, the monitor photodiode serving to monitor a laser power of the light source, and a lens for light collection arranged between the light source and the monitor photodiode and adapted to converge a first-order diffracted beam outputted from the holographic unit and to apply the converged first-order diffracted beam to the monitor photodiode. The optical pick-up device can achieve an enhancement in the efficiency of utilizing a main beam, namely, a zero-order diffracted beam, an improvement in optical characteristics, and an improvement in the axial distance between the light source and the monitor PD.

Description

전반사형 집광렌즈를 이용한 광픽업 장치{OPTICAL PICKUP USING REFLECTIVE FOCUSING LENS} The optical pickup apparatus using the total reflection type light converging lens {OPTICAL PICKUP USING REFLECTIVE FOCUSING LENS}

본 발명은 홀로그램 유니트를 사용하는 광픽업 장치에서 전방 모니터 광 검출기(Front Monitor PD)용의 전반사형 집광렌즈에 관한 것이다. The present invention in the optical pickup device using a hologram unit according to the total reflection type light-converging lens for a front monitor photodetector (Front Monitor PD).

특히 본 발명은 홀로그램(HOE:Hologram Optical Unit)의 1차 광을 모아서 모니터 PD에 입사시키기 위한 전반사형 집광렌즈로서, 집광렌즈의 입사면은 구형이고 반사면은 전반사형 평면이며 출사면은 평면으로 하되 상기 출사면에 대향하는 위치에 모니터 PD를 위치시켜 줌으로써 주 빔의 광 이용 효율을 높이고 광특성 및 축간 거리의 개선을 이룰 수 있도록 한 전방 모니터 광검출기용 전반사형 집광렌즈에 관한 것이다. In particular, the present invention is a hologram: collecting the primary light (HOE Hologram Optical Unit) as a total reflection type light-converging lens for incident on the monitor PD, the incident surface of the focusing lens is spherical and the reflecting surface is a total reflection type planar exit surface is a plane but it relates to the exit surface a front monitor photodetector total reflection type light-converging lens by placing the monitor PD to the position to increase the light utilization efficiency of the main beam can be achieved by giving to the improvement of the optical characteristics and axis-to-axis distance opposite to.

광디스크 기록 장치 중의 하나인 CD-R/RW의 경우 레이저 광출력을 모니터하여 광출력이 일정하도록 구동전류를 조정하는 방법이 이용된다. In this case, the optical disk recording apparatus, one of the CD-R / RW by monitoring the laser light output method of adjusting a drive current, the light output is constant is used. 이를 위하여 모니터 PD를 이용하고 있는데, 레이저 다이오드의 후방에 놓인 광검출기(PD)가 레이저 광출력을 모니터하기는 편리하지만, 레이저 다이오드의 전방 출사 광출력이 후방 출사 광출력에 비해 비선형적이므로 후방 모니터 PD는 정확성이 떨어지는 단점을 가지고 있다. To this end, I'm using a monitor PD, the laser light detector (PD) is placed at the rear of the diode monitoring the laser output is useful but the forward radiated light output of a laser diode nonlinear commutative than the rearward radiated light output rear monitor PD has the disadvantage accuracy is poor. 이런 점을 극복하기 위해서 전방 출사 광을 직접 모니터하는 전방 모니터 PD를 이용한다. In order to overcome this point is used for the front monitor PD to directly monitor the front output light.

도1은 광픽업용 고출력 홀로그램 픽업 모듈(HPM)을 사용하는 CD-R/RW용 픽업에서 전방 모니터 PD용 광학계의 일반적인 구성을 보여주고 있다. Figure 1 is a pickup for the CD-R / RW using the high-power hologram pickup module (HPM) for use in an optical pickup showing a general configuration of an optical system for a front monitor PD.

HPM(101)에서 출력된 광은 시준렌즈(102)를 통해서 평행 빔으로 변환되고 빔 스프리터(103)를 통과하여 반사경(104)에 의해 반사된 다음, 대물렌즈(105)로 집속되어 광디스크(106) 상의 임의의 한 점에 집속된다. The output from the HPM (101) light is focused to the next, the objective lens 105 is reflected by the reflecting mirror 104 is converted into a parallel beam through the collimator lens 102 and passes through the beam splitter 103, an optical disc (106 ) is focused on one arbitrary point on the. 또한 빔 스프리터(103)에 의해서 상기 HOE의 0차 빔의 일부를 모니터 PD(107)로 결상시켜 기록 광파워의 조절에 이용하도록 하고 있다. In addition to image formation by the beam splitter 103, the monitor PD (107) a portion of the zero order beam of the HOE has to be used by the control of the recording optical power.

이와같이 기존의 전방 모니터 PD용 광학계는 HOE의 0차 빔의 일부를 이용하기 때문에 광량의 이용 효율이 떨어진다. Thus conventional front monitor optical system for PD is the efficiency of utilization of light amount drop due to use a portion of the 0th-order beam in the HOE. 또한 광특성이 떨어지고 축간 거리가 길어지는 단점이 있다. In addition, poor optical properties has the disadvantage that a long axis-to-axis distance.

본 발명은 전방 모니터 PD용 전반사형 집광렌즈를 제안한다. The invention proposes a total reflection type light-converging lens front monitor PD. 특히 본 발명은 전방 모니터 PD용 전반사형 집광렌즈가 HOE에서 회절되는 1차 광을 모아서 PD에 입사시켜 줌으로써, 광량 이용 효율을 높이고 광특성 및 축간 거리를 개선할 수 있도록 한 전방 모니터 광검출기용 전반사형 집광렌즈를 제안한다. In particular, the present invention is wide for a front monitor photodetector to improve the optical properties and the axis-to-axis distance by giving to incident on the PD collecting the primary light is the total reflection type light-converging lens front monitor PD is diffracted by the HOE, to increase the amount of light use efficiency It proposes the death condenser lens.

또한 본 발명은 HOE에서 회절되는 1차광을 집광시켜 주기 위한 구면(렌즈면)과 상기 렌즈면에 의해서 집광된 1차광을 모니터 PD상에 결상시켜 주기 위하여 전반사를 이루는 반사 평면 및, 출사면을 포함하는 집광렌즈를 제안한다. The invention also includes a reflective plane, and, the exit surface forms a total reflection to give to form an image of the focused primary light by a spherical surface (lens surface) and the lens surface to give to condense the primary light that is diffracted by the HOE on a monitor PD It proposes a light-converging lens.

또한 본 발명은 상기 집광렌즈가 모니터 PD 까지 상기 HOE의 1차광을 전달시켜 주기 위한 광 도파로를 일체로 갖는 것을 특징으로 하는 전방 모니터 광검출기용 전반사형 집광렌즈를 제안한다. In addition, the present invention proposes a front monitor the total reflection type light converging lens for the optical detector, characterized in that it has an optical waveguide for transmission cycle by the primary light of the HOE is the light converging lens to the monitor PD integrally.

도1은 종래의 전방 모니터 PD용 광학계의 구성을 나타낸 도면 1 is a diagram showing the configuration of a conventional optical system for the front monitor PD

도2는 본 발명의 전반사형 집광렌즈 제1실시예에 따른 전방 모니터 PD용 광학계의 구성을 나타낸 도면 Figure 2 is a diagram showing a configuration of an optical system for a front monitor PD according to the total reflection type light converging lens in the first embodiment of the present invention

도3은 본 발명의 제2실시예에 따른 전반사형 집광렌즈 구조를 나타낸 도면 Figure 3 is a view of the total reflection type light converging lens structure according to the second embodiment of the present invention

본 발명은 홀로그램 유니트를 광원으로 사용하는 광픽업 장치의 광학계에서 상기 홀로그램 유니트에서 회절되는 1차 광을 집속하여 모니터 PD에 결상시켜 주는 전반사형 집광렌즈를 포함하여 이루어지는 것을 특징으로 하는 광픽업 장치이다. The present invention in the optical system of the optical pickup device using a hologram unit as the light source is a optical pickup apparatus which comprises the by focusing the primary light that is diffracted by the hologram unit comprises a total reflection type light converging lens which to form an image on the monitor PD .

또한 본 발명에서, 상기 집광렌즈는 상기 1차 광을 집광시켜 주기 위한 구면의 렌즈면과, 상기 렌즈면을 통과하여 집광된 1차 광을 반사시켜 주기 위한 반사면과, 상기 반사된 1차광을 모니터 PD상에 결상시켜 주기 위한 출사면을 포함하여 이루어지는 것을 특징으로 한다. In addition to the present invention, the condenser lens is primary light of the reflecting surface to give reflects the first difference of the spherical lens surface to give to condense the light and primary light is condensed through the lens surface, the reflected and characterized by comprising comprises the exit surface to give to form an image on the monitor PD.

또한 본 발명에서, 상기 집광렌즈가 상기 1차 광을 상기 모니터 PD로 유도하기 위한 광 도파로를 포함하여 이루어지는 것을 특징으로 한다. In addition, in the present invention, the light-converging lens is the primary light characterized in that comprises an optical waveguide for guiding to the monitor PD.

또한 본 발명에서, 상기 집광렌즈의 1차광 출사면에 모니터 PD가 대면하여 이루어지는 것을 특징으로 한다. In addition, in the present invention, the monitor PD faces the primary light exit surface of the light converging lens is characterized in that formed.

또한 본 발명에서, 상기 집광렌즈가 사출 성형되어 이루어지는 것을 특징으로 한다. Also the condensing lens is injection-molded in the present invention, it is characterized in that formed.

도2는 본 발명의 제1실시예 따른 전반사형 집광렌즈를 포함하는 픽업의 광학계 구조를 보여준다. Figure 2 shows the structure of a pickup optical system including a total reflection type light-converging lens according to Embodiment 1 of the present invention. 광원으로 HPM(201)을 사용하였으며, 상기 HPM(201)에서 출력된 HOE의 0차 광(200a)을 이용하는 주 빔 광학계는 상기 발산하는 0차 광을 평행빔으로 만들어 주기 위한 시준렌즈(202)와, 상기 시준렌즈(202)에 의해서 평행빔으로 변환된 광을 반사시켜 주기 위한 반사경(203), 그리고 상기 반사된 평행빔을 집속하기 위한 대물렌즈(204)와, 상기 대물렌즈(204)에 의해서 집속된 빔이 임의의 한 점에 집속되어 데이터를 읽거나 쓰게 되는 광디스크(205)를 포함하고 있다. Was used for HPM (201) as the light source, the main use of the zero-th order beam (200a) of the HOE generated from the HPM (201) beam optical system is the diverging collimator lens 202 for cycle creates a zero-th order beam into a parallel beam which and, an objective lens 204, the objective lens 204 for focusing the parallel beam of the reflector 203, and the reflection to give reflects the converted light into a parallel beam by the collimator lens 202, the converging beam by the optical disk includes a unit 205 that is to write is focused on one arbitrary point of the read data or. 그리고 상기 HPM(201)로부터 발산하는 1차 회절빔-1차 광(200b)을 모니터 PD(207)로 입사시키는 집광렌즈(206)와 상기 집광렌즈(206)에 의해서 집광된 1차 광이 결상되는 모니터 PD(207)를 포함하고 있다. And first-order diffracted beam -1st order light (200b) for monitoring the primary light is condensed by the image-forming condenser lens 206 and the focusing lens 206 is incident to a PD (207) emanating from the HPM (201) to be monitored includes a PD (207).

상기 집광렌즈(206)의 입사면은 구면으로 렌즈면(206a)을 이루고 있고, 렌즈면(206a)을 통해서 입사된 1차 광을 PD쪽으로 결상시켜 주기 위하여 평면의 반사면(206b)을 갖고 있다. The incident surface of the light converging lens 206 and forms the lens surface (206a), a spherical surface, and has a reflecting surface (206b) of the plane to give by focusing the primary light incident through the lens surface (206a) toward the PD . 그리고 상기 반사면(206b)에서 반사된 1차 광을 모니터 PD상에 결상시켜 주기 위하여 평면의 출사면(206c)을 갖고 있다. And it has an emitting surface (206c) of the plane to form an image to give the primary light reflected by the reflecting surface (206b) on a monitor PD. 상기 반사면(206b)을 비롯한 모든 면은 무코팅된다. All surfaces, including the reflecting surface (206b) is coated free. 상기 출사면(206c)에 대향하여 모니터 PD(207)가 위치한다. And a position monitor PD (207) opposite to said exit surface (206c).

도2의 본 발명 실시예에서 HPM에 사용된 홀로그램(HOE)의 좌우측 회절각은 15.58°와 19.36°이고, 회절 효율은 87.4%(0차 광)와 4.9%(1차 광)이다. Are also left and right diffraction angles is 15.58 ° and 19.36 °, the diffraction efficiency was 87.4% (0 order light) and 4.9% (the first light) of the hologram (HOE) used in the HPM in the present invention embodiment of FIG. 그리고 0차 광을 사용하는 주빔 광학계(특히 시준렌즈)와의 충돌을 피하기 최소화하기 위하여 회절각 19.36°인 1차 회절 광을 이용하며, 레이저 방사각은 최소 7°×16°, 최대 11°×21°이며, 대표적으로는 8°×18.5°이다. And the zero-order main beam optical system using the light, to minimize avoid conflicts with (especially the collimator lens) using the diffraction angle 19.36 ° of the first ordered diffracted ray, and laser radiation angle is at least 7 ° × 16 °, up to 11 ° × 21 °, and typically is 8 ° × 18.5 °.

상기 집광렌즈는 예를 들면 플라스틱을 이용한 사출 성형법으로 제작할 수 있다. The condenser lens may be produced by injection molding using a plastic, for example.

도2에 나타낸 바와같이 본 발명에 따르면 HPM(201)에서 발산하는 0차 광(주빔)(200a)은 시준렌즈(202)에 의해서 평행빔으로 변환되고 반사경(203)에서 전반사되어 대물렌즈(204)를 통해 디스크(205) 상의 임의의 한 점에 집속된다. Fig. In accordance with the present invention as shown in Fig. 2 the zero-th order beam (main beam) (200a) emanating from the HPM (201) is converted into the parallel beam by the collimator lens 202, it is totally reflected by the reflecting mirror 203, an objective lens (204 ) it is focused on one arbitrary point on the disk 205 via the.

그리고, HPM(201)에서 발산하는 1차 광(200b)은 집광렌즈(206)에 의해서 모니터 PD(207)상에 결상된다. Then, the primary light (200b) emanating from the HPM (201) is imaged on a monitor PD (207) by a condenser lens 206. The 즉, HPM에서 출력된 1차 광(200b)은 렌즈면(206a)에 의해서 집광되고, 반사면(206b)에 의해서 전반사되어 출사면(206c)을 통해 모니터 PD(207) 상에 결상된다. In other words, the primary light (200b) output from the HPM is converged by the lens surface (206a), it is totally reflected by the reflecting surface (206b) to form an image on a monitor PD (207) through the output surface (206c).

도3은 본 발명의 집광렌즈 제2실시예 구조를 나타낸다. Figure 3 shows a second example structure of the condenser lens of the present invention. 도3에 나타낸 바와같이 집광렌즈(301)에서 1차 광의 입사면은 구면의 렌즈면(301a)을 이루고, 상기 렌즈면(301a)에 의해서 집광된 1차 광은 내부의 반사면(301b)에서 반사되는데, 이 때 모니터 PD로 상기 반사광이 전파되기 위한 광 도파로(301c)가 형성되어 있고, 이 광 도파로(301c)의 종단에는 출사면(301d)이 이루어져 있다. In the condenser lens 301. As shown in Figure 3 the first light incident surface forms a spherical lens surface (301a), the lens surfaces primary light condensed by a (301a) is on the reflecting surface (301b) of the inner there is reflected, at this time, and the optical waveguide (301c) to become the reflected light is propagated to the monitor PD is formed, the end of the optical waveguide (301c) includes making each of the exit surface (301d). 상기 출사면(301d)은 광 도파로에 대하여 경사져 있고, 그 종단면에 모니터 PD(300)가 밀착되어 있다. The exit surface (301d) is inclined with respect to the optical waveguide, there is a monitor PD (300) close to its vertical sectional view.

도3의 본 발명 제2실시예에 따른 집광렌즈는 광 도파로(301c)를 갖는 구조로서, 모니터 PD(300) 까지 상기 1차 회절 광을 유도하는 구조가 된다. FIG converging lens described in the second embodiment of the three is a structure in which a structure having an optical waveguide (301c), leading to the first-order diffracted light to the monitor PD (300). 이렇게 하면모니터 PD(300)의 위치가 다소 떨어져 있어도 손실없이 1차광을 모니터 PD까지 유도하여 결상시킬 수 있는 장점이 있다. This has the advantage that the location may be slightly focusing the primary light without loss induced by the monitor PD away from the monitor PD (300).

상기 도2 및 도3에 나타낸 바와같이 본 발명의 집광렌즈를 적용한 광학계에 따르면, 모니터 PD용 빔을 HPM의 1차 광을 이용하기 때문에 기존의 주 빔(0차 광)의 일부를 사용하는 경우보다 대물렌즈 출사 광량이 증가하게 된다. According to the optical system applied to the condenser lens of the present invention As shown in Figs. 2 and 3, because of the use of the primary light of the HPM the monitoring PD beam when using some of the existing main beam (0-order light) than the objective lens emitted light amount is increased. 또한 대물렌즈 출사 광량이 증가함에 따라 모니터 PD 입사 광량이 선형적이어서 광기록 파워 제어에 문제가 없음을 확인할 수 있다. In addition, to determine the objective lens increases, the emitted light quantity monitor PD incident light is linearly have come not a problem to an optical recording power is controlled in response.

또한, 방사각이 증가하기 때문에 광효율도 증가한다. In addition, the optical efficiency increases since the radiation angle increases. 그리고 집광렌즈의 반사면에 적절한 각도를 줌으로써 여기서 반사되는 광이 HOE로 피드백되어 영향을 주는 것을 방지할 수 있기 때문에 안정성의 문제도 자연스럽게 해결된다. And by giving a suitable angle on the reflection surface of the condenser lens the light reflected here is fed back to the HOE it is solved because it can be prevented from affecting the stability of the problem naturally.

본 발명에서는 홀로그램 유니트의 HOE에서 회절되는 1차광을 모아서 모니터 PD에 입사시켜 준다. In the present invention, collecting the primary light that is diffracted by the HOE of the hologram unit gives to the incident monitor PD. 그러므로 주 빔(0차 광)의 이용 효율을 높일 수 있고, 광특성의 개선과 축간 거리 개선이 가능하게 된다. Therefore, it is possible to increase the utilization efficiency of the main beam (0-order light), and the axis-to-axis distance is improved to improve the optical characteristics can be realized.

Claims (5)

  1. 홀로그램 유니트를 광원으로 사용하는 광픽업 장치의 광학계에서 상기 홀로그램 유니트에서 회절되는 1차 광을 집속하여 모니터 PD에 결상시켜 주는 전반사형 집광렌즈를 포함하여 이루어지며, Becomes to focus the primary light that is diffracted by the hologram unit comprises a total reflection type light converging lens to form an image by the monitor PD a hologram unit in the optical system of the optical pickup apparatus using as a light source,
    상기 집광렌즈는, 상기 1차 광을 집광시켜 주기 위한 구면의 렌즈면과, 상기 렌즈면을 통과하여 집광된 1차 광을 반사시켜 주기 위한 반사면과, 상기 반사된 1차광을 상기 모니터 PD 상에 결상시켜 주기 위한 출사면을 포함하는 것 을 특징으로 하는 광픽업 장치. The condensing lens, said first spherical lens surface to give to condense the light, and the reflecting surface to give reflects the lens surface by the focused primary pass light, the reflected primary light the monitor PD phase to form an image in the optical pickup device characterized in that comprises the exit surface for periods.
  2. 삭제 delete
  3. 제 1 항에 있어서, 상기 집광렌즈가 상기 1차 광을 상기 모니터 PD로 유도하기 위한 광 도파로를 포함하여 이루어지는 것을 특징으로 하는 광픽업 장치. The method of claim 1, wherein the optical pickup apparatus is characterized in that the collecting lens is formed, including an optical waveguide for guiding the primary light to the monitor PD.
  4. 제 1 항에 있어서, 상기 집광렌즈의 1차광 출사면에 모니터 PD가 대면하여 이루어지는 것을 특징으로 하는 광픽업 장치. The method of claim 1, wherein the optical pickup device which comprises the monitor PD faces the primary light exit surface of the light converging lens.
  5. 제 1 항에 있어서, 상기 집광렌즈가 사출 성형되어 이루어지는 것을 특징으로 하는 광픽업 장치. The method of claim 1, wherein the optical pickup apparatus is characterized in that the light-converging lens is made of injection-molded.
KR20000085003A 2000-12-29 2000-12-29 Optical pickup using reflective focusing lens KR100455478B1 (en)

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US5475210A (en) * 1991-09-09 1995-12-12 Kabushiki Kaisha Toshiba Noise reduction system for optical record and reproduction apparatus using auto-power controlled semiconductor laser device
US5640380A (en) * 1994-08-04 1997-06-17 Matsushita Electric Industrial Co., Ltd. Optical head with a translucent plate to split a light beam
JPH11273119A (en) * 1998-03-24 1999-10-08 Pioneer Electron Corp Optical pickup device
US6584060B1 (en) * 1998-06-24 2003-06-24 Ricoh Company, Ltd. Optical pick-up device for recording/reading information on optical recording medium

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